Yuo can do it with a few variables and a series of conditional statements. Lets set up a _global variables, we'll call it _global.newclip. Declared it on the _root timeline. Lets the user clicks on contact, we'll have this code:
ActionScript Code:
on(release){
if(_global.newclip != "contact"){
_global.newclip = "contact";
_level50.gotoAndPlay(26);
}
}
Now at the end of the loaded swf's, you can put this
ActionScript Code:
loadMovie(_global.newclip + ".swf",50);
Keep in mind I'm doing this off the top of my head, so if there are any errors, dont kill me. This is the basic logic for what you're trying to do, it can be greatly improved upon.